Not sure if you'll get what you want especially given you could be meeting on a Thursday! The Plough up the hill from the station is a big venue that might give you the space you need. I'd also suggest the Roundhouse but with there in particular, you'd be better off around the back of the bar, where you might better be able to hear each other if it's a busy night. Anywhere else in there you're almost on top of the bar.
Failing that, perhaps somewhere down the far end of Northcote Road might be better.
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